CODEWITHSUNDEEP
javascriptnode.jstypescripttypeorm
lulliezy
lulliezy

Reputation: 2063

TypeORM relation with a field apart from id

I wanted to create a one-to-many relation in TypeORM with a field other than id, the usual relation looks like this, but in the same example, lets say for instance the User table's column name was also unique, now I want to reference that in the relation, which then the foreign key in photos would contain value of name and give it a different column name in Photos table other than userId to be e.g. userName, how exactly would i do that, am stuck and frankly hove no idea how to proceed.

Upvotes: 3

Views: 2060

Answers (2)

subparry
subparry

Reputation: 353

For future reference

If you want your relation to point to a column other than id, you must add referencedColumnName: '<column name here>' to your @JoinColumn() options.

e.g:

@Entity()
export class Photo {

    @PrimaryGeneratedColumn()
    id: number;

    @Column()
    url: string;

    @ManyToOne(() => User, user => user.photos)
    @JoinColumn({ name: 'userName', referencedColumnName: 'name' })
    user: User;

}

Also, be careful of specifying the referencedColumnName from typeORM's point of view, not the real underlying driver column name. For example, if you want to reference a column named user_name, but your entity's property uses camelCase userName, you must specify:

referencedColumnName: 'userName'

if you specify the database column name instead, you will get errors complaining that typeORM could not find the referenced column in your entity definition.

Upvotes: 2

username_jj
username_jj

Reputation: 275

@Entity()
export class Photo {

    @PrimaryGeneratedColumn()
    id: number;

    @Column()
    url: string;

    @ManyToOne(() => User, user => user.photos)
    @JoinColumn({ name: 'userName' }) // < -- add this line
    user: User;

}


@Entity()
export class User {

    @PrimaryGeneratedColumn()
    id: number;

    @Column()
    name: string;

    @OneToMany(() => Photo, photo => photo.user)
    photos: Photo[];
}

Upvotes: 1

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